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Because Decker project can only have one color palette at a time you'll have to use a script to change the palette for a specific cards.

Here's one example in the All About Color deck, here, on the page about Palette Transitions.

Or you could also check out the palettefade module for some additional tools to change colors in cool ways.

But while you're making your project you probably need an easy way to switch between your palettes whenever you want to.

Personally, I tend to use these two widgets for my projects: a button and a grid (styled as a listbox). The button will save your current palette as an option in the list, so you can just click it to switch between them anytime.

%%WGT0{"w":[{"name":"pals16","type":"grid","size":[155,103],"pos":[316,30],"locked":1,"script":"on click row do\n p:\"|\"split me.rowvalue.palette\n if 16~count p\n  background.text:p[0]\n  foreground.text:p[1]\n  red       .text:p[2]\n  pink      .text:p[3]\n  orange    .text:p[4]\n  yellow    .text:p[5]\n  green     .text:p[6]\n  darkgreen .text:p[7]\n  blue      .text:p[8]\n  cyan      .text:p[9]\n  purple    .text:p[10]\n  lightbrown.text:p[11]\n  darkbrown .text:p[12]\n  lightgray .text:p[13]\n  mediumgray.text:p[14]\n  darkgray  .text:p[15]\n  f:\"%06H\"\n  patterns[32]:f parse p[0]\n  patterns[47]:f parse p[1]\n  patterns[33]:f parse p[2]\n  patterns[34]:f parse p[3]\n  patterns[35]:f parse p[4]\n  patterns[36]:f parse p[5]\n  patterns[37]:f parse p[6]\n  patterns[38]:f parse p[7]\n  patterns[39]:f parse p[8]\n  patterns[40]:f parse p[9]\n  patterns[41]:f parse p[10]\n  patterns[42]:f parse p[11]\n  patterns[43]:f parse p[12]\n  patterns[44]:f parse p[13]\n  patterns[45]:f parse p[14]\n  patterns[46]:f parse p[15]\n  \n end\nend","headers":1,"lines":0,"widths":[128,82],"format":"ss","value":{"area":["outside","inside"],"palette":["F8F8F0|3F3A3F|807173|C6AFA5|DAC3BC|F0DFBC|23493C|337650|82B26E|715A49|5D463C|FFBB66|D7A371|94C6FF|82ADE6|5566A8","E4E9F3|1A1C2C|5D4650|82695D|444667|947B76|2B499E|38B764|305553|263A6E|3B5DC9|41A6F6|73D0F7|2D3C73|1E2637|1E2128"]},"row":0},{"name":"button5","type":"button","size":[52,34],"pos":[228,67],"script":"on click do\n colors:(\"%06H\" format deck.patterns[32]),\n (\"%06H\" format deck.patterns[47]),\n (each  i in range 14 (\"%06H\" format deck.patterns[33+i]) end)\n newpal:\"|\" fuse colors\n newpalname:alert[\"Please name your palette\" \"string\" \"New Palette\"]\n pals16.value:insert area palette with newpalname newpal into pals16.value\nend","text":"Save\nPalette"}],"d":{}}

I hope this helps a little! Feel free to start a new thread if you have more questions about how to do specific things with multiple palettes, I think it's something that a bunch of people are interested in.